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Description
This work will provide an overview of the operation of the Optically Pumped Polarized Ion Source (OPPIS) during the polarized proton Run 24 of the Relativistic Heavy Ion Collider (RHIC).
The functionality of the source has been achieved by the upgrades focused on three key areas: performance, stability and safety
A 10 % enhancement of the beam transport efficiency was achieved by shortening the LEBT line and replacing electrostatic Einzel lenses with magnetic quadrupole lenses. Furthermore, optimization of the Rb and Na cells has mitigated the vapors dispersions in the beamline resulting in a significant reduction of Rb and Na consumption and enhanced source stability. Modifications in the plasmatron have led to a substantial increase source components lifetime (over 6 months of operation), thus ensuring a reduction of duty factor.
The upgrades confirmed the reliable operation through the whole Run 24 with a mean 350 µA / 300 µs current and an average 80 % polarization effectively provided at the end of the 200 MeV linac. The source development have also established the groundwork for remarkable achievements in view of future development.In this regard, we tested an extended 450 µs beam pulse width with minimal polarization losses (10%) and the successful injection of $1\times10^{12}$ protons into the Booster.
